Hello, I have a problem with the signal slots. I have a main.cpp file and 2 classes, mainwindow and server.

The main.cpp is the next one:

Qt Code: 
  1. w = new MainWindow();
  2.     zerbitzaria = new Server();
  3.     //Konexioak egiten dira zerbitzariarekin
  4.  
  5.     qDebug () << QObject::connect(zerbitzaria, &Server::setSEtxekoPuntuakGora, w, &MainWindow::setMWEtxekoPuntuakGora);
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I create 2 different objects and the I connect it.

In the server.h file I have this:

Qt Code: 
  1. class Server: public QObject
  2. {
  3.     Q_OBJECT
  4. signals:
  5.     void setSEtxekoPuntuakGora();
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In server.cpp I call to the signal using emit command:

Qt Code: 
  1. switch (comandos)
  2.        {
  3.            case agindua::EtxekoPuntuakGora:
  4.            {
  5.                 emit setSEtxekoPuntuakGora();
  6.                 break;
  7.            }
  8.        }
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In the mainwindow class, I have defined the slot(mainwindow.h):
Qt Code: 
  1. public slots:
  2.     void setMWEtxekoPuntuakGora();
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And then i have implemented (mainwindows.cpp):

Qt Code: 
  1. void MainWindow::setMWEtxekoPuntuakGora()
  2. {
  3.     int A = ui->LCD_Etxekoak->intValue();
  4.     A++;
  5.     if (A < 999 && A>=0) ui->LCD_Etxekoak->display(A);
  6. }
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both classes has the Q_OBJECT. And I have debugged and see that the connect function return true. Finally I put the breakpoint at the emit setSEtxekoPuntuakGora(); point and I see that the debugger stops there. So everything is ok but it never enters in the slot function.

Can anyone help me?
Thank you